Abstract
Four Tropical Rainfall Measuring Mission (TRMM) datasets of latent heating were diagnosed for signals in the Madden-Julian oscillation (MJO). In all four datasets, vertical structures of latent heating are dominated by two components-one deep with its peak above the melting level and one shallow with its peak below. Profiles of the two components are nearly ubiquitous in longitude, allowing a separation of the vertical and zonal/temporal variations when the latitudinal dependence is not considered. All four datasets exhibit robust MJO spectral signals in the deep component as eastward propagating spectral peaks centered at a period of 50 days and zonal wavenumber 1, well distinguished from lower- and higher-frequency power and much stronger than the corresponding westward power. The shallow component shows similar but slightly less robust MJO spectral peaks. MJO signals were further extracted from a combination of bandpass (30-90 day) filtered deep and shallow components. Largest amplitudes of both deep and shallow components of the MJO are confined to the Indian and western Pacific Oceans. There is a local minimum in the deep components over the Maritime Continent. The shallow components of the MJO differ substantially among the four TRMM datasets in their detailed zonal distributions in the Eastern Hemisphere. In composites of the heating evolution through the life cycle of the MJO, the shallow components lead the deep ones in some datasets and at certain longitudes. In many respects, the fourTRMMdatasets agree well in their deep components, but not in their shallow components and in the phase relations between the deep and shallow components. These results indicate that caution must be exercised in applications of these latent heating data.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 3488-3508 |
| Number of pages | 21 |
| Journal | Journal of the Atmospheric Sciences |
| Volume | 67 |
| Issue number | 11 |
| DOIs | |
| State | Published - Nov 2010 |
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Keywords
- Latent heating/cooling
- Madden-Julian oscillation
- Satellite observations
- Spectral analysis/models/distribution
ASJC Scopus subject areas
- Atmospheric Science
Cite this
MJO signals in latent heating : Results from TRMM retrievals. / Zhang, Chidong; Ling, Jian; Hagos, Samson; Tao, Wei Kuo; Lang, Steve; Takayabu, Yukari N.; Shige, Shoichi; Katsumata, Masaki; Olson, William S.; L'ecuyer, Tristan.
In: Journal of the Atmospheric Sciences, Vol. 67, No. 11, 11.2010, p. 3488-3508.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - MJO signals in latent heating
T2 - Results from TRMM retrievals
AU - Zhang, Chidong
AU - Ling, Jian
AU - Hagos, Samson
AU - Tao, Wei Kuo
AU - Lang, Steve
AU - Takayabu, Yukari N.
AU - Shige, Shoichi
AU - Katsumata, Masaki
AU - Olson, William S.
AU - L'ecuyer, Tristan
PY - 2010/11
Y1 - 2010/11
N2 - Four Tropical Rainfall Measuring Mission (TRMM) datasets of latent heating were diagnosed for signals in the Madden-Julian oscillation (MJO). In all four datasets, vertical structures of latent heating are dominated by two components-one deep with its peak above the melting level and one shallow with its peak below. Profiles of the two components are nearly ubiquitous in longitude, allowing a separation of the vertical and zonal/temporal variations when the latitudinal dependence is not considered. All four datasets exhibit robust MJO spectral signals in the deep component as eastward propagating spectral peaks centered at a period of 50 days and zonal wavenumber 1, well distinguished from lower- and higher-frequency power and much stronger than the corresponding westward power. The shallow component shows similar but slightly less robust MJO spectral peaks. MJO signals were further extracted from a combination of bandpass (30-90 day) filtered deep and shallow components. Largest amplitudes of both deep and shallow components of the MJO are confined to the Indian and western Pacific Oceans. There is a local minimum in the deep components over the Maritime Continent. The shallow components of the MJO differ substantially among the four TRMM datasets in their detailed zonal distributions in the Eastern Hemisphere. In composites of the heating evolution through the life cycle of the MJO, the shallow components lead the deep ones in some datasets and at certain longitudes. In many respects, the fourTRMMdatasets agree well in their deep components, but not in their shallow components and in the phase relations between the deep and shallow components. These results indicate that caution must be exercised in applications of these latent heating data.
AB - Four Tropical Rainfall Measuring Mission (TRMM) datasets of latent heating were diagnosed for signals in the Madden-Julian oscillation (MJO). In all four datasets, vertical structures of latent heating are dominated by two components-one deep with its peak above the melting level and one shallow with its peak below. Profiles of the two components are nearly ubiquitous in longitude, allowing a separation of the vertical and zonal/temporal variations when the latitudinal dependence is not considered. All four datasets exhibit robust MJO spectral signals in the deep component as eastward propagating spectral peaks centered at a period of 50 days and zonal wavenumber 1, well distinguished from lower- and higher-frequency power and much stronger than the corresponding westward power. The shallow component shows similar but slightly less robust MJO spectral peaks. MJO signals were further extracted from a combination of bandpass (30-90 day) filtered deep and shallow components. Largest amplitudes of both deep and shallow components of the MJO are confined to the Indian and western Pacific Oceans. There is a local minimum in the deep components over the Maritime Continent. The shallow components of the MJO differ substantially among the four TRMM datasets in their detailed zonal distributions in the Eastern Hemisphere. In composites of the heating evolution through the life cycle of the MJO, the shallow components lead the deep ones in some datasets and at certain longitudes. In many respects, the fourTRMMdatasets agree well in their deep components, but not in their shallow components and in the phase relations between the deep and shallow components. These results indicate that caution must be exercised in applications of these latent heating data.
KW - Latent heating/cooling
KW - Madden-Julian oscillation
KW - Satellite observations
KW - Spectral analysis/models/distribution
UR - http://www.scopus.com/inward/record.url?scp=78649464936&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78649464936&partnerID=8YFLogxK
U2 - 10.1175/2010JAS3398.1
DO - 10.1175/2010JAS3398.1
M3 - Article
AN - SCOPUS:78649464936
VL - 67
SP - 3488
EP - 3508
JO - Journals of the Atmospheric Sciences
JF - Journals of the Atmospheric Sciences
SN - 0022-4928
IS - 11
ER -